Transmitter Receiver
how to make a receiver for a given rated transmitter?
i have to make a receiver for a given transmitter with known frequency and power ratings. further, what equipment i can use to know the signal strength?
Mostly, you need to know the channel.
Link budgets are often done on dB so that losses can be added.
So something like
source strength (power?) – channel losses = received signal strength (power?)
Then add the receiver & other noise.
Then often you will have a concept like detection threshold, that is the minimum signal to noise ratio that the receiver can detect the signal.
so if (source power – channel losses)/(total noise at receiver) > detection threshold then the link works.
So what is your link?
optical?
wire?
wireless?
ultrasonic?
What’s your transmission?
Information?
presence only, like a door minder looking for people going past?
1GB per second data?
Signals back from space-craft?
Ok, you get the idea. Give some more details & you;ll get better answers.
If it is simple wireless, then the channel will be the dominant factor.
If it is more realistic wireless, then multiple-path fading will be the dominant factor, causing destructive interference from multiple paths, scatterers. This affects reliability from second to second.
If it is really realistic, factor in a “noise” for other systems, other transmitters, and generally other interferers.
The things about these things is that they change with time, so measuring the signal strength can be a bit complicated too. Should do some stats on how often you need it to work & how often the channel will be too bad.
If it is a data link, then detection can be a bit complicated.
Maybe, I’ve given you an idea where to start?
Transmitter Receiver
Are FM Transmitters worth while trying for a car audio solution?
There are a lot of different types of transmitters available to purchase, each differs in performance and quality. As with everything else in life you get the good and the bad. The problem with transmitters is that the bad are very bad and give the other products a poor reputation on the back of theirs.
FM Transmitters by nature are designed with a slight fault, in that they are prone to interference from other signal frequencies. This can manifest in two ways either the transmitter signal is blocked because the other signal is stronger or interference is received over either audio playback, resulting in echo, buzz or both.
The actual quality of the audio being played through the transmitter is generally quite good. Most genuine products such as Griffin iTrip FM Transmitter , dexim and or logic3 offer audio equivalent to a good radio station (radio 1 for example) however its generally expected if you use a frequency close to a powerful local or national station you will receive a little interference at some point during connection.
The solution to this problem however is simple. Firstly select a signal which is clear of any radio stations, this will reduce the amount of interference heard, secondly if your frequency picks up any in the future simple change frequency. The Griffin iTrip Fm Transmitter for example has 3 pre-set frequency’s to change to if you do happen to receive quality issues with the current settings.
FM Transmitters are a good solution if you only want a simple iPod input in your car, If for example you don’t need an integrated kit that offers full digital quality, iPod control and text display the Transmitter could be the kit for you.
About the Author
A small saying that my granddad used to say to me “you get what you pay for” generally rings true in all walks of life. If you buy a cheap transmitter you should expect the performance to be poorer than other kits, from our experience the griffin tend to offer the best all round performance in the iPod Fm Transmitter world.
linked bluetooth transmitter Receiver?
I want to link to electronic devices by bluetooth, yet neither of these devices have bluetooth already in them. Is it possible to buy just the transmitter/receivers and can i get some that are already linked together?
What are the devices?
I’ve added Bluetooth to PCs with a USB dongle, but I doubt you could add it to, say, a phone that doesn’t have it already.
433MHz transmitter and Receiver
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